Class JobPrioritySupported is an integer valued printing attribute
class that specifies whether a Print Service instance supports the
JobPriority attribute and the number of different job
priority levels supported.

The client can always specify any JobPriority value from
1 to 100 for a job. However, the Print Service instance may support fewer
than 100 different job priority levels. If this is the case, the Print
Service instance automatically maps the client-specified job priority value
to one of the supported job priority levels, dividing the 100 job priority
values equally among the available job priority levels.

IPP Compatibility: The integer value gives the IPP integer value. The
category name returned by getName() gives the IPP attribute name.